Abstract
A multi-anvil device was used to synthesize 24 mg of pure γ-Fe2SiO4 crystals at 8.5 GPa and 1,273 K. The low-temperature heat capacity (C p) of γ-Fe2SiO4 was measured between 5 and 303 K using the heat capacity option of a physical properties measurement system. The measured heat capacity data show a broad λ-transition at 11.8 K. The difference in the C p between fayalite and γ-Fe2SiO4 is reduced as the temperature increases in the range of 50–300 K. The gap in C p data between 300 and 350 K of γ-Fe2SiO4 is an impediment to calculation of a precise C p equation above 298 K that can be used for phase equilibrium calculations at high temperatures and high pressures. The C p and entropy of γ-Fe2SiO4 at standard temperature and pressure (S°298) are 131.1 ± 0.6 and 140.2 ± 0.4 J mol−1 K−1, respectively. The Gibbs free energy at standard pressure and temperature (ΔG° f,298) is calculated to be −1,369.3 ± 2.7 J mol−1 based on the new entropy data. The phase boundary for the fayalite–γ-Fe2SiO4 transition at 298 K based on current thermodynamic data is located at 2.4 ± 0.6 GPa with a slope of 25.4 bars/K, consistent with extrapolated results of previous experimental studies.
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Acknowledgments
The authors are grateful to C. Henderson for his help in EMP analysis, and R.C. Rouse for his help with XRD measurements. We gratefully acknowledge the constructive reviews of K.-D. Grevel and one anonymous reviewer, which improved the quality of the manuscript. This work was supported by Scott Turner Research Grant by the Department of Geological Sciences, University of Michigan to the senior author, NSF grants EAR 96-28196, 99-11352, 00-87448 and 05-37068 to E.J. Essene, NSF grants EAR 03-10142 and 00-79827 to M. Hirschmann at University of Minnesota, and grant P15880-N11 of the Austrian Science Fund to E. Dachs at the University of Salzburg.
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Yong, W., Dachs, E., Withers, A.C. et al. Heat capacity of γ-Fe2SiO4 between 5 and 303 K and derived thermodynamic properties. Phys Chem Minerals 34, 121–127 (2007). https://doi.org/10.1007/s00269-006-0133-7
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DOI: https://doi.org/10.1007/s00269-006-0133-7